(Spoilers)The rejoining kinda useless.

[Snugglez]

What I don't get is how the Ascians were actually tempered by Zodiark if they all possess the Echo.

Correct me if i'm wrong, but it looks like the implication thus far is that the Echo is not inherently a power with "anti-temper" properties like we had thought, but that since the sundering, hydaelyn seems to immediately temper people who awaken their Echo, like tuning into a looped transmission of her voice. Beings already tempered cannot be tempered by other primals.